Head trimmer



FIG. 1 is a perspective view of a head trimmer, showing our new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof, the left side view being identical thereto;

FIG. 5 is a back view thereof; and,

FIG. 6 is a top view thereof.

The broken lines in the drawings illustrate portions of the head trimmer and form no part of the claimed design. 

CLAIM The ornamental design for a head trimmer, as shown and described. 